Time- and angle-resolved x-ray diffraction to probe structural and chemical evolution during Al-Ni intermetallic reactions
- CIW
We present novel time- and angle-resolved x-ray diffraction (TARXD) capable of probing structural and chemical evolutions during rapidly propagating exothermic intermetallic reactions between Ni-Al multilayers. The system utilizes monochromatic synchrotron x-rays and a two-dimensional (2D) pixel array x-ray detector in combination of a fast-rotating diffraction beam chopper, providing a time (in azimuth) and angle (in distance) resolved x-ray diffraction image continuously recorded at a time resolution of {approx}30 {micro}s over a time period of 3 ms. Multiple frames of the TARXD images can also be obtained with time resolutions between 30 and 300 {micro}s over three to several hundreds of milliseconds. The present method is coupled with a high-speed camera and a six-channel optical pyrometer to determine the reaction characteristics including the propagation speed of 7.6 m/s, adiabatic heating rate of 4.0 x 10{sup 6} K/s, and conductive cooling rate of 4.5 x 10{sup 4} K/s. These time-dependent structural and temperature data provide evidences for the rapid formation of intermetallic NiAl alloy within 45 {micro}s, thermal expansion coefficient of 1.1 x 10{sup -6} K for NiAl, and crystallization of V and Ag{sub 3}In in later time.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- NSFOTHER U.S. GOVERNMENT
- OSTI ID:
- 1029009
- Journal Information:
- Rev. Sci. Instrum., Vol. 82, Issue (11) ; 11, 2011; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- ENGLISH
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